[Q] Tablet doesn't turn on

I have successfully rooted my GT P7500 and installed ClockWork Recovery. When I tried to create a backup in it, the backup process got stuck. Probably because lack of free space during the backup process as there was a lot of data. So I tried to reboot the device - first time it booted up and got stuck on homescreen. So I had to reset it. After reset the device does not start at all - display is off (no reaction), battery is fine (was around 50%), even putting on charger does not do anything to show up on display.

Is there a way to do something about it? A special "reset" or anything?

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